他说他很高兴，但他的话听起来不真诚。

He said he was pleased, but his words ___rang ___hollow.

一切都让她觉得不真实，于是她决定跟着他去了解发生了什么。

Everything ___rang ___hollow to her, so she decided to follow him to understand what had happened.

尽管他看起来真诚，但他的承诺听起来不真实。

Despite his sincere appearance, his promises ___ring ___hollow.